package jvm;

/**
 * @Date 2020-10-22 19:31
 * @Author Pzy
 * @Description
 */
public class Demo01 {

    public static void main(String[] args) {
        int i = 10;
        int j = 20;
        int k = i + j;

        String str = "abcd";
        str = str.replace("a", "h");
        System.out.println("str = " + str);
    }

}
